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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6358e84c0aa2b989eeb12804a4201a41ad2ef6cf63c95dfe2849d516d4ad84af' 
  AND token = 'dBPMZQu0kL7MXJUt6yCRqolRF0eECNCm0+zjyToQhLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}